GB662081A - Production of fibrous water-soluble alginates - Google Patents

Production of fibrous water-soluble alginates

Info

Publication number
GB662081A
GB662081A GB1079849A GB1079849A GB662081A GB 662081 A GB662081 A GB 662081A GB 1079849 A GB1079849 A GB 1079849A GB 1079849 A GB1079849 A GB 1079849A GB 662081 A GB662081 A GB 662081A
Authority
GB
United Kingdom
Prior art keywords
water
fibrous
alginic acid
liquid
isopropanol
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB1079849A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kelco Co
Original Assignee
Kelco Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kelco Co filed Critical Kelco Co
Priority to GB1079849A priority Critical patent/GB662081A/en
Publication of GB662081A publication Critical patent/GB662081A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
    • C08B37/00—Preparation of polysaccharides not provided for in groups C08B1/00 - C08B35/00; Derivatives thereof
    • C08B37/006—Heteroglycans, i.e. polysaccharides having more than one sugar residue in the main chain in either alternating or less regular sequence; Gellans; Succinoglycans; Arabinogalactans; Tragacanth or gum tragacanth or traganth from Astragalus; Gum Karaya from Sterculia urens; Gum Ghatti from Anogeissus latifolia; Derivatives thereof
    • C08B37/0084—Guluromannuronans, e.g. alginic acid, i.e. D-mannuronic acid and D-guluronic acid units linked with alternating alpha- and beta-1,4-glycosidic bonds; Derivatives thereof, e.g. alginates

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Biochemistry (AREA)
  • Molecular Biology (AREA)
  • Engineering & Computer Science (AREA)
  • General Health & Medical Sciences (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)

Abstract

Water-soluble alginates are made by a process which includes the steps of reacting fibrous solid alginic acid with a base capable of forming a water-soluble alginate in the presence of a liquid medium consisting of water and at least 35 per cent by volume of a water-miscible, volatile organic liquid in which the desired water-soluble alginate is substantially insoluble, the proportion of said organic liquid being chosen so as substantially to prevent solution of the reaction product and to produce a fibrous reaction product in which the fibrous nature of the original alginic acid is substantially maintained, separating excess liquid from the product and drying. Thus, fibrous alginic acid obtained, e.g. as described in U.S.A. Specification 1,814,981 is dried by pressure, shredded, mixed with the solvent, the alkaline agent added and after gentle stirring the mixture is drained and the product dried. Solvents specified are methyl, ethyl, n-propyl and tert.-butyl alcohols, acetone, methyl ethyl and diethyl ketone and especially isopropanol, Alkaline agents specified are alkaline compounds of alkali metals and magnesium-ammonium hydroxide and carbonate, quaternnary ammonium bases, e.g. benzyl trimethyl ammonium hydroxide, alkyl-, aryl- and alkarylamines, di- and tri-amines and heterocyclic bases. A quantity of liquid about 0.8 galls. per lb. of anhydrous acid is quoted as being sufficient. The amount of water present should not allow of solution of the alginate thus with isopropanol about 40 vols. of alcohol may be used with 60 of water. The volumetric relationship is in general solvent 35; water 65 to solvent 50; water 50. In examples alginic acid is treated with isopropanol, and (1) sodium carbonate, (2) aqueous ammonia, and (3) triethanolamine.
GB1079849A 1949-04-22 1949-04-22 Production of fibrous water-soluble alginates Expired GB662081A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1079849A GB662081A (en) 1949-04-22 1949-04-22 Production of fibrous water-soluble alginates

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1079849A GB662081A (en) 1949-04-22 1949-04-22 Production of fibrous water-soluble alginates

Publications (1)

Publication Number Publication Date
GB662081A true GB662081A (en) 1951-11-28

Family

ID=9974453

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1079849A Expired GB662081A (en) 1949-04-22 1949-04-22 Production of fibrous water-soluble alginates

Country Status (1)

Country Link
GB (1) GB662081A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1039054B (en) * 1952-12-10 1958-09-18 Smit & Zoon A Process for the production of alkali alginates
US5482932A (en) * 1992-09-04 1996-01-09 Courtaulds Fibres (Holdings) Limited Alginate gels to the form of fibrous pastes useful as wound dressings

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1039054B (en) * 1952-12-10 1958-09-18 Smit & Zoon A Process for the production of alkali alginates
US5482932A (en) * 1992-09-04 1996-01-09 Courtaulds Fibres (Holdings) Limited Alginate gels to the form of fibrous pastes useful as wound dressings

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